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powerpc: Use a datatype for instructions

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Currently unsigned ints are used to represent instructions on powerpc.
This has worked well as instructions have always been 4 byte words.

However, ISA v3.1 introduces some changes to instructions that mean
this scheme will no longer work as well. This change is Prefixed
Instructions. A prefixed instruction is made up of a word prefix
followed by a word suffix to make an 8 byte double word instruction.
No matter the endianness of the system the prefix always comes first.
Prefixed instructions are only planned for powerpc64.

Introduce a ppc_inst type to represent both prefixed and word
instructions on powerpc64 while keeping it possible to exclusively
have word instructions on powerpc32.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
[mpe: Fix compile error in emulate_spe()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe
2020-05-06 13:40:31 +10:00
committed by Michael Ellerman
parent 217862d9b9
commit 94afd069d9
26 changed files with 237 additions and 214 deletions
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4
arch/powerpc/kernel/kgdb.c
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@@ -419,7 +419,7 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
unsigned int instr;
unsigned int *addr = (unsigned int *)bpt->bpt_addr;
struct ppc_inst *addr = (struct ppc_inst *)bpt->bpt_addr;
err = probe_kernel_address(addr, instr);
if (err)
@@ -438,7 +438,7 @@ int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
unsigned int instr = *(unsigned int *)bpt->saved_instr;
unsigned int *addr = (unsigned int *)bpt->bpt_addr;
struct ppc_inst *addr = (struct ppc_inst *)bpt->bpt_addr;
err = patch_instruction(addr, ppc_inst(instr));
if (err)